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Additional Financial Information	6 Months Ended
Additional Financial Information	Mar. 31, 2017
Additional Financial Information [Abstract]
Additional Financial Information	10. Additional Financial Information Cash Interest and Taxes The Company made interest payments of approximately $17 million and $34 million during the three months ended March 31, 2017 and March 31, 2016, respectively. The Company made interest payments of approximately $64 million and $88 million during the six months ended March 31, 2017 and March 31, 2016, respectively. The Company paid approximately $13 million of income and withholding taxes, partially offset by $3 million of refunds during the three months ended March 31, 2017 and paid approximately $7 million of income and withholding taxes with no offsetting refunds during the three months ended March 31, 2016. The Company paid approximately $22 million of income and withholding taxes, partially offset by $3 million of refunds during the six months ended March 31, 2017 and paid approximately $13 million of income and withholding taxes with no offsetting refunds during the six months ended March 31, 2016. Special Cash Dividend On December 2, 2016, the Company’s Board of Directors approved a special cash dividend of $54 million which was paid on January 3, 2017 to stockholders of record as of December 30, 2016.